Identification of Coastal Typology and Utilization of Geospatial Technology for Tsunami Hazard Modeling in Kulon Progo Coastal Area, Special Region of Yogyakarta, Indonesia

Abstract

Tsunamis are natural disasters that cause material losses and cause loss of life. Tsunamis are generated by underwater earthquakes. The coastal region of Kulon Progo is prone to the risk of a tsunami disaster due to its proximity to the megathrust zone and direct exposure to the Indian Ocean. This research aims to (1) determining the typological characteristics in the Kulon Progo Coastal Area, Special Region of Yogyakarta; (2) determining the spatial distribution of tsunami hazards in the Kulon Progo Coastal Area, Special Region of Yogyakarta; (3) developing recommendations for tsunami disaster mitigation models in the coastal area of Kulon Progo, special region of Yogyakarta. The method used in this research is the Hloss calculation developed by Berryman-2006. Furthermore, the identification of coastal typology was carried out according to Shepard with field observations, which were taken based on the Identification of Coastal Geomorphology according to Khakhim-2008. The research results show that tsunami inundation modeling with scenarios of 5, 10, 15, 20, 25, and 30 meters inundated the entire area with 14,462.22 hectares. It is known that the identification of the Kulon Progo coastal typology is marine deposition coast and coast built by organisms. Suitable recommendations for tsunami disaster mitigation on the Kulon Progo coast are the application of green belts around the coastline and the constructing of breakwaters. The results of this research can be used as a basis for determining tsunami disaster risk reduction policies in the coastal area of Kulon Progo, Special Region of Yogyakarta.